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Buddleia is a woody and deciduous ornamental shrub that grows up to 3m tall. The small mauve/purple flowers are orange inside and form distinctive cone-shaped hanging clusters between December and February, followed by seed capsules 5-10mm long.
The plant invades river beds/streamsides, disturbed areas, shrubland and forest margins. It tolerates a wide range of soils and temperatures, prefers wet to moderately dry conditions, and is resistant to wind and damage. It can grow in shade or open areas, but seedlings require high light levels.
Buddleia establishes and grows quickly, forming dense thickets in a wide range of habitats, excluding other plants. It reproduces vegetatively through regeneration from suckers, as well as producing vast numbers of highly viable seeds, which complete with native varieties.